wasSharpNET – Blame information for rev 5
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5 | office | 1 | /////////////////////////////////////////////////////////////////////////// |
2 | // Copyright (C) Wizardry and Steamworks 2016 - License: GNU GPLv3 // |
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3 | // Please see: http://www.gnu.org/licenses/gpl.html for legal details, // |
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4 | // rights of fair usage, the disclaimer and warranty conditions. // |
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5 | /////////////////////////////////////////////////////////////////////////// |
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6 | |||
7 | using System; |
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8 | using System.Net; |
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9 | |||
10 | namespace wasSharpNET.Network |
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11 | { |
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12 | /// <summary> |
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13 | /// Subnet Mask. |
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14 | /// </summary> |
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15 | /// <remarks>https://blogs.msdn.microsoft.com/knom/2008/12/31/ip-address-calculations-with-c-subnetmasks-networks/</remarks> |
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16 | public static class SubnetMask |
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17 | { |
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18 | public static readonly IPAddress ClassA = IPAddress.Parse("255.0.0.0"); |
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19 | public static readonly IPAddress ClassB = IPAddress.Parse("255.255.0.0"); |
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20 | public static readonly IPAddress ClassC = IPAddress.Parse("255.255.255.0"); |
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21 | |||
22 | public static IPAddress CreateByHostBitLength(int hostpartLength) |
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23 | { |
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24 | var hostPartLength = hostpartLength; |
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25 | var netPartLength = 32 - hostPartLength; |
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26 | |||
27 | if (netPartLength < 2) |
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28 | throw new ArgumentException("Number of hosts is to large for IPv4"); |
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29 | |||
30 | var binaryMask = new byte[4]; |
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31 | |||
32 | for (var i = 0; i < 4; i++) |
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33 | { |
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34 | if (i*8 + 8 <= netPartLength) |
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35 | binaryMask[i] = 255; |
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36 | else if (i*8 > netPartLength) |
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37 | binaryMask[i] = 0; |
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38 | else |
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39 | { |
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40 | var oneLength = netPartLength - i*8; |
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41 | var binaryDigit = |
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42 | string.Empty.PadLeft(oneLength, '1').PadRight(8, '0'); |
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43 | binaryMask[i] = Convert.ToByte(binaryDigit, 2); |
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44 | } |
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45 | } |
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46 | return new IPAddress(binaryMask); |
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47 | } |
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48 | |||
49 | public static IPAddress CreateByNetBitLength(int netpartLength) |
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50 | { |
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51 | var hostPartLength = 32 - netpartLength; |
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52 | return CreateByHostBitLength(hostPartLength); |
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53 | } |
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54 | |||
55 | public static IPAddress CreateByHostNumber(int numberOfHosts) |
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56 | { |
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57 | var maxNumber = numberOfHosts + 1; |
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58 | |||
59 | var b = Convert.ToString(maxNumber, 2); |
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60 | |||
61 | return CreateByHostBitLength(b.Length); |
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62 | } |
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63 | } |
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64 | } |